簡易法き裂コードCANISの改良および熱過渡事象への適用

• Material Type: 文書・図像類
• Title: 簡易法き裂コードCANISの改良および熱過渡事象への適用
• Author/Editor: 古橋 一郎; 若井 隆純
• Author Heading: 古橋 一郎; 若井 隆純
• Publication Date: 1995-08
• Publication Date (W3CDTF): 1995-08
• Alternative Title: Revisions of simplified crack analysis code CANIS and applications to thermal transient events.
• Periodical title: PNC TN9460 95-003
• Text Language Code: jpn
• Target Audience: 一般
• Note (General): FBR構造物における破壊力学的評価の精度向上及び適用性拡大のため,簡易法亀裂解析コードCANISを板厚内の非線形応力分布及び広範な事象を取扱えるように改良した。改良CANISコードにより,非線形ピーク応力が無視できない5ケースの熱過渡事象について,半楕円表面亀裂が存在する場合に対し,直線応力分布,放物線応力分布及び3次式応力分布を仮定した3種類の破壊力学解析を実施した。数値解析結果を分析した結果,非線形ピーク応力を無視し,直線応力分布を仮定した場合は,深さ方向,長さ方向ともパラメータが過小評価され,所定き裂深さにおけるき裂長さや,漏洩確率,漏洩量及び破断確率を過小評価する結果,非保守的な評価となる。; Revisions were done on CANIS for more acculate fracture mechanics evaluations of FBR structures and for extension of applicabilities of CANIS, by considering nonlinear stress distributions through the wall and more generalized events. Following 3-types of analyses were done by revised CANIS on the 5-cases of typical thermal transient events of FBR structures containing semi-elliptical surface crack. *Analysis-1$\sim$ assumed linear stress distribution through the wall. The thermal stresses were expressed by membrane and bending stresses, and nonlinear peak stresses were ignored. *Analysis-2$\sim$ assumed parabolic stress distribution through the wall. The thermal stresses were expressed by inner and outer stresses and membrane stress. *Analysis-3$\sim$ assumed 3-order polynomials stress distribution through the wall. The thermal stresses were expressed by inner and outer stresses and membrane and bending stresses. Following results were obtained from these numerical analyses. (1)If membrane stress can be ignored, parameters ($\Delta$K, $\Delta$J, da/dn) at deepest point reach maximum values when crack is shallow, and decrease continuously. If membrane stress can't be ignored, these parameters increase again after some depth. (2)Parameters ($\Delta$K, $\Delta$J, db/dn) at surface point increase continuously. (3)These aspects ((1), (2)) are almost same for analysis-1, -2 and -3. (4)Quantities and depth/length ratios are different between analysis-1, -2 and -3. (5)Analysis-2 and -3 bring little differences on the results, and are in a good agreement with ATTF test results. (6)Analysis-1, ignoring nonlinear peak stresses, estimates smaller parameters both at deepest and surface points, than analysis-2, -3 and ATTF test results. These differences are somewhat large at surface point. Therefore crack length estimated in analysis-1 is smaller than those in analysis-2 and -3 for same crack depth. (7)If leak probability, leak rate and break probability of FBR ...
• Source: /PNC-TN9460-95-003.pdf （fulltext）; https://jopss.jaea.go.jp/pdfdata/PNC-TN9460-95-003.pdf
• Access Restrictions: 限定公開
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 日本原子力研究開発機構 : JOPSS:JAEA Originated Papers Searching System

• Summary, etc.: FBR構造物における破壊力学的評価の精度向上及び適用性拡大のため,簡易法亀裂解析コードCANISを板厚内の非線形応力分布及び広範な事象を取扱えるように改良した。改良CANISコードにより,非線形ピーク応力が無視できない5ケースの熱過渡事象について,半楕円表面亀裂が存在する場合に対し,直線応力分布,放...